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Loans - Composition of Loan Portfolio By Class of Loan (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  | $ 66,585 | $ 95,358 |
Impaired Financing Receivable, Recorded Investment |  | 56,564 | 70,426 | $ 80,664
Impaired Financing Receivable, Related Allowance |  | 684 | 548 |
Loan Balance |  | 5,372,483 | 5,271,857 |
Accrued Interest Receivable |  | 16,659 | 14,973 |
Recorded Investment |  | 5,389,142 | 5,286,830 |
Commercial, financial and agricultural |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 18,039 | 20,624 | 30,595
Loan Balance | [1] | 1,053,453 | 994,619 |
Accrued Interest Receivable | [1] | 4,413 | 3,558 |
Recorded Investment | [1] | 1,057,866 | 998,177 |
Commercial real estate |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 18,142 | 24,474 | 18,025
Loan Balance | [1] | 1,167,607 | 1,155,703 |
Accrued Interest Receivable | [1] | 4,283 | 4,161 |
Recorded Investment | [1] | 1,171,890 | 1,159,864 |
Construction real estate |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan Balance |  | 181,470 | 188,945 |
Recorded Investment |  | 182,017 | 189,466 |
Commercial |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 1,324 | 2,226 | 6,720
Loan Balance |  | 125,389 | 135,343 |
Accrued Interest Receivable |  | 401 | 398 |
Recorded Investment |  | 125,790 | 135,741 |
Mortgage |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan Balance |  | 52,203 | 48,699 |
Accrued Interest Receivable |  | 133 | 106 |
Recorded Investment |  | 52,336 | 48,805 |
Installment |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan Balance |  | 3,878 | 4,903 |
Accrued Interest Receivable |  | 13 | 17 |
Recorded Investment |  | 3,891 | 4,920 |
Commercial |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 19,059 | 23,102 | $ 25,324
Loan Balance |  | 393,094 | 406,687 |
Accrued Interest Receivable |  | 1,029 | 940 |
Recorded Investment |  | 394,123 | 407,627 |
Mortgage |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan Balance |  | 1,110,426 | 1,169,495 |
Accrued Interest Receivable |  | 1,516 | 1,459 |
Recorded Investment |  | 1,111,942 | 1,170,954 |
HELOC |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan Balance |  | 203,178 | 212,441 |
Accrued Interest Receivable |  | 974 | 853 |
Recorded Investment |  | 204,152 | 213,294 |
Installment |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan Balance |  | 18,526 | 19,874 |
Accrued Interest Receivable |  | 53 | 67 |
Recorded Investment |  | 18,579 | 19,941 |
Consumer |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan Balance |  | 1,241,736 | 1,120,850 |
Accrued Interest Receivable |  | 3,808 | 3,385 |
Recorded Investment |  | 1,245,544 | 1,124,235 |
Leases |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan Balance |  | 2,993 | 3,243 |
Accrued Interest Receivable |  | 36 | 29 |
Recorded Investment |  | 3,029 | 3,272 |
Financing Receivable With No Related Allowance Recorded [Member] | Commercial, financial and agricultural |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  | 19,899 | 41,075 |
Impaired Financing Receivable, Recorded Investment |  | 14,704 | 19,965 |
Financing Receivable With No Related Allowance Recorded [Member] | Commercial real estate |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  | 18,974 | 23,961 |
Impaired Financing Receivable, Recorded Investment |  | 18,060 | 23,474 |
Financing Receivable With No Related Allowance Recorded [Member] | Commercial |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  | 2,788 | 3,662 |
Impaired Financing Receivable, Recorded Investment |  | 1,324 | 2,226 |
Financing Receivable With No Related Allowance Recorded [Member] | Commercial |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  | 19,346 | 24,409 |
Impaired Financing Receivable, Recorded Investment |  | 19,012 | 22,687 |
Financing Receivable With Related Allowance Recorded [Member] | Commercial, financial and agricultural |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  | 5,394 | 810 |
Impaired Financing Receivable, Recorded Investment |  | 3,335 | 659 |
Impaired Financing Receivable, Related Allowance |  | 681 | 152 |
Financing Receivable With Related Allowance Recorded [Member] | Commercial real estate |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  | 137 | 1,014 |
Impaired Financing Receivable, Recorded Investment |  | 82 | 1,000 |
Impaired Financing Receivable, Related Allowance |  | 2 | 309 |
Financing Receivable With Related Allowance Recorded [Member] | Commercial |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  | 47 | 427 |
Impaired Financing Receivable, Recorded Investment |  | 47 | 415 |
Impaired Financing Receivable, Related Allowance |  | $ 1 | $ 87 |
[1] | Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class.

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